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Definition of: bladder
(blad′ər) noun
1. Anat. a A distensible membranous sac in the anterior part of the pelvic cavity, for the temporary retention of urine. b Some part or organ of analogous structure. ◆Collateral adjective: vesical.
2. Biol. An air vessel or an air cell in some seaweeds.
3. Anything puffed out, empty, or unsubstantial.
4. A blister or pustule. [OE bldre]
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